rgsmitty,
I have no experience with the JD cabs, but have owned a Kubota Grand L 3430 HSTC for more than three years. The factory cab is tight, quiet, easy in and out, two doors, toolbox, cup holder, heats quickly, cools colder than I need it and has met all my expectations. Purchase the rear wiper, rear lights and radio kit. Purchase radio from Best Buy or ?
One feature I really like is the spacoius cab allows you to turn sideways in the seat when operating a rear mounted snowblower and easily operate the reverse function of the treadle hydrostatic pedal with my left foot. Easier on the neck.
The Kubota cab will not disappoint. You will not go wrong with this cab.
OrangeGuy